import com.sun.org.apache.xpath.internal.operations.Bool;

public class Student {

      static  String sno = null;
      static  String name = null;
      static  String sex = null;
      static  String birth = null;
      static  String mno = null;
      static  String grade = null;

    Student(String sno,String name,String sex,String birth,String mno,String grade){
        this.sno = sno;
        this.name = name;
        this.sex = sex;
        this.birth = birth;
        this.mno = mno;
        this.grade = grade;
    }

    public static String getBirth() {
        return birth;
    }

    public static String getGrade() {
        return grade;
    }

    public static String getMno() {
        return mno;
    }

    public static String getName() {
        return name;
    }

    public static String getSex() {
        return sex;
    }

    public static String getSno() {
        return sno;
    }

    public static void setBirth(String birth) {
        Student.birth = birth;
    }

    public static void setGrade(String grade) {
        Student.grade = grade;
    }

    public static void setMno(String mno) {
        Student.mno = mno;
    }

    public static void setName(String name) {
        Student.name = name;
    }

    public static void setSex(String sex) {
        Student.sex = sex;
    }

    public static void setSno(String sno) {
        Student.sno = sno;
    }

    public static void putNull(){
        sno = null;
        name = null;
        sex = null;
        birth = null;
        mno = null;
        grade = null;
    }

    public static Boolean isNull(){
        if (sno!=null){
            return false;
        }else{
            return true;
        }
    }
}
